Finding the Fourth Proportional to 3,389.80, 5,085.49 and 1,081.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,389.80 : 5,085.49 = 1,081.30 : x
2. Step 2: Convert to fraction form
   3,389.80/5,085.49 = 1,081.30/x
3. Step 3: Cross multiply
   3,389.80x = 5,085.49 × 1,081.30
4. Step 4: Simplify right side
   3,389.80x = 5,498,914.91
5. Step 5: Solve for x
   x = 5,498,914.91/3,389.80
6. Step 6: Final answer
   x = 1,622.20